Back
Cerodinium navarrianum
From Fensome et al., 2019:
Cerodinium navarrianum (Srivastava, 1995, p.274, pl.7, figs.1–3) Williams et al., 1998, p.103. Holotype: Srivastava, 1995, pl.7, fig.2. Originally Ceratiopsis (generic name illegitimate), subsequently (and now) Cerodinium. Age:
Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description Srivastava, 1995
Description-Cysts compressed peridinioid, pentagonal to roundly pentagonal with a single long apical and two equal divergent tapering antapical horns, sides straight to slightly convex; cornucavate, rarely slightly bicavate, endocyst pentagonal to roundly pentagonal filling the main body; periphragm smooth with a few wrinkles aligned longitudinally, sometimes anastomosing in certain areas; endophragm smooth; paratabulation indicated by an archeopyle and a low irregular paracingulum; archeopyle intercalary, 2a type, operculum free; paracingulum low transverse parallel ridges, ridges sometimes granular.
Size measurements--Total length x breadth range 104-169 x 49-99 ~m in eight specimens.
Holotype--Pl. 7, fig. 2; photomicrograph reference no. 85029/11; objective x 40; microscope locationhorizontal 19.0/ vertical 113.0; size-total length x breadth 122 x 73 ~m, endocyst 70 x 70 ~m; sample no. CRC 32140-1/slide 1; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--PI. 7, figs 1, 3; photomicrograph reference no. 85030/34; objective x 40; microscope location horizontal 18.0/ vertical 102.0; size-total length x breadth 133 x 81 ~m, sample no. CRC 32140-1/Slide 7; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--Pl. 7, fig. 3; photomicrograph reference no. 85030/6; objective x 40; microscope location horizontal 20.5/vertical 113.0; size-total length x breadth 169 x 99 ~m; sample no. CRC 32140-1/Slide 4; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Remarks-C navarriana is distinct from C albertii (Corradini), C striata (Drugg), and C subquadra (Corradini) in being cornucavate; from C cordifera (May) and C leptoderma Vozzhennikova in having pentagonal endocyst; from C crassisthata (Jain et at.) and C granulostriata (Jain & Millepied) in having smooth endocyst and from C pannucea (Stanley) in lacking well-developed paracingulum.
Name derivation-After Navarro Group from Navarro County, Texas.
Cerodinium navarrianum (Srivastava, 1995, p.274, pl.7, figs.1–3) Williams et al., 1998, p.103. Holotype: Srivastava, 1995, pl.7, fig.2. Originally Ceratiopsis (generic name illegitimate), subsequently (and now) Cerodinium. Age:
Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description Srivastava, 1995
Description-Cysts compressed peridinioid, pentagonal to roundly pentagonal with a single long apical and two equal divergent tapering antapical horns, sides straight to slightly convex; cornucavate, rarely slightly bicavate, endocyst pentagonal to roundly pentagonal filling the main body; periphragm smooth with a few wrinkles aligned longitudinally, sometimes anastomosing in certain areas; endophragm smooth; paratabulation indicated by an archeopyle and a low irregular paracingulum; archeopyle intercalary, 2a type, operculum free; paracingulum low transverse parallel ridges, ridges sometimes granular.
Size measurements--Total length x breadth range 104-169 x 49-99 ~m in eight specimens.
Holotype--Pl. 7, fig. 2; photomicrograph reference no. 85029/11; objective x 40; microscope locationhorizontal 19.0/ vertical 113.0; size-total length x breadth 122 x 73 ~m, endocyst 70 x 70 ~m; sample no. CRC 32140-1/slide 1; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--PI. 7, figs 1, 3; photomicrograph reference no. 85030/34; objective x 40; microscope location horizontal 18.0/ vertical 102.0; size-total length x breadth 133 x 81 ~m, sample no. CRC 32140-1/Slide 7; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Paratype--Pl. 7, fig. 3; photomicrograph reference no. 85030/6; objective x 40; microscope location horizontal 20.5/vertical 113.0; size-total length x breadth 169 x 99 ~m; sample no. CRC 32140-1/Slide 4; locality DW12, the Navarro Group, the Corsicana Clay, Navarro County, Texas; Maastrichtian.
Remarks-C navarriana is distinct from C albertii (Corradini), C striata (Drugg), and C subquadra (Corradini) in being cornucavate; from C cordifera (May) and C leptoderma Vozzhennikova in having pentagonal endocyst; from C crassisthata (Jain et at.) and C granulostriata (Jain & Millepied) in having smooth endocyst and from C pannucea (Stanley) in lacking well-developed paracingulum.
Name derivation-After Navarro Group from Navarro County, Texas.